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| Titel |
Role of de novo biosynthesis in ecosystem scale monoterpene emissions from a boreal Scots pine forest |
| VerfasserIn |
Risto Taipale, Maija K. Kajos, Johanna Patokoski, Pekka Rantala, Taina M. Ruuskanen, Janne Rinne |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049462
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| Zusammenfassung |
| Monoterpene emissions from Scots pine have traditionally been assumed to originate as
evaporation from specialized storage pools. More recently, the significance of de novo
emissions, originating directly from monoterpene biosynthesis, has been recognized. To study
the role of biosynthesis in the ecosystem scale, we measured monoterpene emissions from a
Scots pine dominated forest in southern Finland using the disjunct eddy covariance method
combined with proton transfer reaction mass spectrometry. The interpretation of
the measurements was based on a hybrid emission algorithm describing both de
novo and pool emissions. During the measurement period May–August 2007, the
monthly medians of daytime emissions were 170, 280, 180, and 180 μg m-2 h-1.
The emission potential for both de novo and pool emissions exhibited a decreasing
summertime trend. The ratio of the de novo emission potential to the total emission
potential varied between 30% and 46%. Although the monthly changes were not
significant, the ratio always differed statistically from zero, i.e. the role of de novo
biosynthesis was evident. The hybrid approach showed promising potential for the
improvement of the ecosystem scale emission modelling. Given this feature and the
significant role of biosynthesis, we recommend incorporating both de novo and pool
emissions into the monoterpene emission algorithms for Scots pine dominated forests. |
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